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WO2015028251A1 - Procédé de commande d'un système d'injection de carburant d'un moteur à combustion interne dont l'injecteur de carburant est alimenté par gravité - Google Patents

Procédé de commande d'un système d'injection de carburant d'un moteur à combustion interne dont l'injecteur de carburant est alimenté par gravité Download PDF

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Publication number
WO2015028251A1
WO2015028251A1 PCT/EP2014/066607 EP2014066607W WO2015028251A1 WO 2015028251 A1 WO2015028251 A1 WO 2015028251A1 EP 2014066607 W EP2014066607 W EP 2014066607W WO 2015028251 A1 WO2015028251 A1 WO 2015028251A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injector
fuel injection
fuel
internal combustion
combustion engine
Prior art date
Application number
PCT/EP2014/066607
Other languages
English (en)
Inventor
Pramod REDDEMREDDY
Ramachandra PRADEEP
Geetesh GADKARI
Original Assignee
Robert Bosch Gmbh
Robert Bosch Engineering And Business Solutions Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh, Robert Bosch Engineering And Business Solutions Limited filed Critical Robert Bosch Gmbh
Publication of WO2015028251A1 publication Critical patent/WO2015028251A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections

Definitions

  • the present invention relates to a method of controlling fuel injection system for an internal combustion engine. More particularly, the present invention relates to a method of controlling gasoline fuel injection system.
  • EFI Electronic Fuel Injection
  • the EFI system currently includes a fuel tank, a fuel pump, an Electronic Control Unit (ECU) and a fuel injector that can operate between for example, 0 to 100 Hz with respect to the engine speed.
  • ECU Electronic Control Unit
  • EFI systems include the pump to create the pressure required to achieve appropriate atomization at the fuel injector.
  • the atomization is important because it ensures proper mixture of fuel with the air.
  • the fuel injector is required to ensure complete combustion in the internal combustion engine.
  • high pressure pump may not be required.
  • a method of controlling a gravity-fed fuel injection system includes the step of operating at least one fuel injector at a predetermined frequency, characterized in that, the frequency of operation of the at least one fuel injector is independent of engine speed.
  • the frequency of operation for the at least one fuel injector is a constant.
  • the step comprises fixing ON and OFF duration for each operation of the at least one fuel injector.
  • the method further includes the steps of determining number of pulses that are required for fuel injection for a single four stroke cycle of the internal combustion engine, and operating the at least one fuel injector with the determined number of pulses within the single four stroke cycle.
  • an Electronic Control Unit for a gravity-fed fuel injection system.
  • the ECU is adapted for operating the at least one fuel injector at a predetermined frequency, characterized in that, the frequency of operation of the at least one fuel injection is independent of the engine speed.
  • the ECU is further adapted for determining number of pulses of fuel injection for a single four stroke cycle of the internal combustion engine and for operating the at least one fuel injector with the determined number of pulses within the single four stroke cycle.
  • Figure 1 illustrates a gravity fed electronic fuel injection system in accordance with an embodiment of the present invention
  • Figure 2 is a graph illustrating operating frequency of at least one fuel injector in accordance with an embodiment of the present invention
  • Figure 3 is a flowchart illustrating a method of controlling a gravity fed fuel injection system in accordance with an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating an Electronic Control Unit (ECU) for controlling a gravity fed fuel injection system in accordance with an embodiment of the present invention.
  • ECU Electronic Control Unit
  • Figure 1 illustrates a gravity fed fuel injection system 100 in accordance with an embodiment of the present invention.
  • the fuel injection system 100 includes a fuel reservoir 102, a connecting pipe 104, a fuel injector 106 and an Electronic Control Unit (ECU) 108. It may be noted that, unlike most electronic fuel injection systems, the fuel injection system 100 does not include any pump to pressurize the fuel that is to be supplied to the fuel injector 106.
  • the fuel injector 106 is adapted to meter, atomize and provide a fine spray of the fuel at a combustion cylinder of the internal combustion engine.
  • Some of the parameters of the fuel injector 106 that are controlled by the ECU 108, in accordance with various embodiments of the present invention include operating frequency of the fuel injector 106, fuel injection timing, number of pulses per fuel injection window, and duty cycle of the fuel injector 106.
  • the duty cycle may refer to proposition of ON or opening duration of the fuel injector 106 and OFF or closed duration. In the same example, the duty cycle may be represented in percentage.
  • Figure 2 is a graph 200 illustrating operating frequency of the fuel injector 106 in accordance with an embodiment of the present invention.
  • the graph 200 includes a Y-axis 204 representing volts (V) and an X-axis 206 represents time (t) in seconds.
  • Duration taken for ON and OFF event combined to form one cycle or pulse of fuel injection is represented as %'.
  • the cycles per unit time or hertz (Hz), derived as "l/ti”. provides operating frequency of the fuel injector 106.
  • the operating frequency may refer to possible number of fuel injection events per second.
  • the operating frequency of the fuel injector 106 is kept constant and predetermined irrespective of any change in engine speed. If the operating frequency of the fuel injector 106 is 100Hz, then time taken for 'single fuel injection event' is 10 millisecond (ms). It may be noted that, the operating frequency of the fuel injector 106 is fixed or programmed in the ECU 108 that controls the operation of the fuel injector 106.
  • the operating frequency of the fuel injector 106 is greater than speed of the internal combustion engine.
  • fuel injection windows (210, 212, and 214) represent duration of fuel injection in respective four stroke cycles.
  • a single four stroke cycle may include two complete rotations of crank shaft (not shown in the figure) attached to the internal combustion engine.
  • the number of pulses (208) are varied.
  • the number of pulses (208) is four, in a second fuel injection window 212, the number of pulses (208) is three, and in a third fuel injection window 214, the number of pulses (208) is five.
  • the operating frequency of the fuel injector 106 is kept constant and the number of pulses to open and close the injector is varied based upon the engine speed and load.
  • tl is kept constant for the windows 210, 212 and 214.
  • duty cycle of fuel injection may be approximately 50%.
  • the proposition of the ON and OFF duration is represented in percentage as the duty cycle of the fuel injection.
  • the duty cycle is kept constant. In other embodiments the duty cycle may vary depending upon the engine speed and load.
  • Figure 3 is a flowchart 300 illustrating a method of controlling the gravity fed electronic fuel injection system 100 in accordance with an embodiment of the present invention.
  • a predetermined operating frequency of the fuel injector 106 is fetched, for example, from memory of the ECU 108.
  • the operating frequency of the fuel injector 106 is independent of the speed of the internal combustion engine. For example, even when the speed of the internal combustion varies, the operating frequency of the fuel injector 106 is kept constant. Hence, the operating frequency is independent of the speed of the internal combustion engine. Further, in an exemplary embodiment, the operating frequency of the fuel injector 106 is greater than speed of the internal combustion engine.
  • step 306 the number of pulses that are required for fuel injection for a single four stroke cycle of the internal combustion engine is determined. In accordance with various embodiments of the present invention, the number of pulses of fuel injection is varied. In step 308, the fuel injector 106 with the determined number of pulses within the single four stroke cycle is operated. In step 310, ON and OFF duration for each cycle of operation of the fuel injector is fixed. In an embodiment of the present disclosure, proposition of the ON and OFF duration of the fuel injector may represent a duty cycle of fuel injection represented in percentage and is not varied.
  • FIG. 4 is a block diagram illustrating an Electronic Control Unit (ECU) for controlling a gravity fed fuel injection system in accordance with an embodiment of the present invention.
  • ECU Electronic Control Unit
  • the ECU 108 is an embedded system.
  • the ECU 108 includes a memory 402, a microprocessor 404, a bus 406, an Input and Output (I/O) port 408, and a communication interface 410.
  • the ECU 108 is configured to control the fuel injection system 200 to meet the fuel demand of an internal combustion engine 428. More particularly, the ECU 108 controls the fuel injector 106 which may act as both the fuel injector and a positive displacement pump. In an exemplary embodiment, the ECU 108 is adapted to control operating parameters of the fuel injection system 200 such as operating frequency, flow rate, pulses, duty cycle of fuel injection and so on and so forth.
  • the ECU 108 may also include an oscillator (not shown in the figure) or a system clock, a Power Supply Module (PSM) (not shown in the figure), an analog signal conditioner and a digital signal conditioner.
  • PSM Power Supply Module
  • the ECU 108 has a set of predefined instructions installed in the memory 402.
  • the memory 402 can constitute one or more of Read Only Memory (ROM), Random Access Memory (RAM), Electrically Erasable and Programmable Memory (EEPROM,) and a Non-Volatile RAM.
  • the set of predefined instructions which are stored in the memory 402 are executed with the help of a machine such as the microprocessor 404 or a microcontroller.
  • the ECU 108 in accordance with the present embodiment is adapted to perform the predefined instructions including operation of the fuel injector 106 at a predetermined frequency, wherein the frequency of operation of the fuel injector 106 is independent of the speed of the internal combustion engine 428.
  • the ECU 108 in association with the microprocessor 404 is capable of determining number of pulses that are required for fuel injection for a single four stroke cycle of the internal combustion engine 428, and operating the fuel injector 106 with the determined number of pulses within the single four stroke cycle.
  • output of an intake manifold pressure sensor 416, an intake manifold temperature sensor 414, an engine speed sensor 418, and a crankshaft position sensor 420 are connected to the ECU 108.
  • the ECU 108 may take multiple inputs including pressure, temperature, engine speed, crankshaft position, load requirements, and other parameters associated with the internal combustion and control the fuel injector 106 in accordance with the set of predefined instructions including operating the fuel injector 106 at a predetermined frequency that is independent of engine speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé pour commander un système d'injection électronique de carburant alimenté par gravité. Le procédé comprend les étapes consistant à faire fonctionner l'au moins un injecteur de carburant à une fréquence prédéfinie. La fréquence de fonctionnement de l'au moins un injecteur de carburant est indépendante du régime moteur. Le procédé comprend en outre les étapes consistant à déterminer un nombre d'impulsions d'injection de carburant pour un seul cycle à quatre temps du moteur à combustion interne, et à faire fonctionner l'au moins un injecteur de carburant avec le nombre déterminé d'impulsions au cours du cycle à quatre temps unique.
PCT/EP2014/066607 2013-08-26 2014-08-01 Procédé de commande d'un système d'injection de carburant d'un moteur à combustion interne dont l'injecteur de carburant est alimenté par gravité WO2015028251A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3770CH2013 2013-08-26
IN3770/CHE/2013 2013-08-26

Publications (1)

Publication Number Publication Date
WO2015028251A1 true WO2015028251A1 (fr) 2015-03-05

Family

ID=51298737

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/066607 WO2015028251A1 (fr) 2013-08-26 2014-08-01 Procédé de commande d'un système d'injection de carburant d'un moteur à combustion interne dont l'injecteur de carburant est alimenté par gravité

Country Status (1)

Country Link
WO (1) WO2015028251A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014553A1 (de) * 2000-03-23 2001-10-04 Daimler Chrysler Ag Verfahren zum Betrieb einer direkteinspritzenden Otto-Brennkraftmaschine
WO2002063155A1 (fr) * 2001-02-08 2002-08-15 Robert Bosch Gmbh Procede, programme informatique et appareil de commande ou de regulation pour l'exploitation d'un moteur a combustion interne, ainsi que moteur a combustion interne
US20030192511A1 (en) * 2002-04-10 2003-10-16 Da Cunha John M. System and method for delivering combustible liquids
GB2421543A (en) * 2005-08-05 2006-06-28 Scion Sprays Ltd I.c. engine fuel injection system with a positive displacement pump dispensing a fixed amount of fuel
DE102008001044A1 (de) * 2008-04-08 2009-10-15 Robert Bosch Gmbh Verfahren und Vorrichtung zum Steuern eines Aktuators, Computerprogramm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014553A1 (de) * 2000-03-23 2001-10-04 Daimler Chrysler Ag Verfahren zum Betrieb einer direkteinspritzenden Otto-Brennkraftmaschine
WO2002063155A1 (fr) * 2001-02-08 2002-08-15 Robert Bosch Gmbh Procede, programme informatique et appareil de commande ou de regulation pour l'exploitation d'un moteur a combustion interne, ainsi que moteur a combustion interne
US20030192511A1 (en) * 2002-04-10 2003-10-16 Da Cunha John M. System and method for delivering combustible liquids
GB2421543A (en) * 2005-08-05 2006-06-28 Scion Sprays Ltd I.c. engine fuel injection system with a positive displacement pump dispensing a fixed amount of fuel
DE102008001044A1 (de) * 2008-04-08 2009-10-15 Robert Bosch Gmbh Verfahren und Vorrichtung zum Steuern eines Aktuators, Computerprogramm

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